I participated in a league like that for about 10 Summers, through 1998. Rather than converting the golf score to a bowling score, they broke up the nine holes into three groups of three holes, and assigned one point for each three holes, and one for total. Likewise, it was one point per game of bowling, and one for total, so it was possible to win eight points a night.
The league fell apart because we ran out of people who were willing to pay the $30 or so that it took to cover the costs of golf and bowling. There's talk that they may try to start this league up again, but I'm not holding my breath. If they do, though, I'll be there for it.
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...formerly "The Curse of Dusty," and "Poöter Boöf" before that...